US5132845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High mangification objective lens system
Assignee: Olympus Corp
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Filing: 1991-07-05
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Granted: 1992-07-21
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Expires: 2011-07-05
Abstract
Abstract A high magnification objective lens system comprising, in the order from the object side, a first positive lens unit which comprises a positive meniscus lens component having a concave surface on the object side and a plurality of positive cemented lens components, and has a function to converge a light bundle coming from an object, a second negative lens unit which comprises a negative lens component having a concave surface on the object side, a third lens unit which comprises a positive cemented lens component and has a positive refractive power, and a fourth lens unit which has a negative refractive power. This objective lens system has magnification on the order of 250× and a long working distance, and is of the apochromatic grade.
Inventors
- 👤 Toshinobu Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:01
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
A high magnification objective lens system comprising, in the order from the object side, a first lens unit comprising a positive meniscus lens component concave on the object side and a plurality of positive cemented lens components, and having a positive refractive power as a whole, a second lens unit comprising a negative lens component concave on the object side and having a negative refractive power as a whole, a third lens unit comprising a positive cemented lens component and having a positive refractive power as a whole, and a fourth lens unit having a negative refractive power as a whole.
Claim 2
Dependent Claim
101 words
A high magnification objective lens system comprising, in the order from the object side, a first lens unit comprising a positive meniscus lens component concave on the object side and a plurality of positive cemented lens components, and having a positive refractive power as a whole, a second lens unit comprising a negative lens component concave on the object side and having a negative refractive power as a whole, a third lens unit comprising a positive cemented lens component and having a positive refractive power as a whole, and a fourth lens unit having a negative refractive power as a whole.
Claim 3
Dependent Claim
25 words
A high magnification objective lens system according to claim 1 wherein said fourth lens unit comprises a negative lens component concave toward the object side.
Claim 4
Dependent Claim
92 words
A high magnification objective lens system according to claim 2 satisfying the conditions (1), (2) and (3) listed below: 1<d.sub.1 /<4.5 (1) -0.1<f/f.sub.2 <-0.01 (2) -0.7<f/f.sub.4 <-0.1 (3) wherein the reference symbol f represents the focal length of the objective lens system as a whole, the reference symbols f 2 and f 4 designate the focal lengths of the second lens unit and the fourth lens unit respectively, and the reference symbol d 1 denotes the thickness of the center of the positive meniscus lens component arranged in the first lens unit.
Claim 5
Dependent Claim
45 words
A high magnification objective lens system according to claim 1 wherein the lens component arranged on the image side in the first lens unit and the lens component arranged on the object side in the second lens unit have concave surfaces opposed to each other.
Claim 6
Dependent Claim
28 words
A high magnification objective lens system according to claim 1 wherein the first lens unit comprises a cemented lens component consisting of positive, negative and positive lens elements.
Claim 7
Dependent Claim
28 words
A high magnification objective lens system according to claim 1 wherein the third lens unit comprises a cemented lens component consisting of positive, negative and positive lens elements.
Claim 8
Dependent Claim
20 words
A high magnification objective lens system according to claim 1 wherein the fourth lens unit comprises a cemented lens component.
Claim 9
Dependent Claim
64 words
A high magnification objective lens system comprising, in the order from the object side, a positive meniscus lens component concave on the object side, three cemented lens components, a pair of lens components having concave surfaces opposed to each other, a cemented lens component, a negative lens component concave on the object side and one or more lens components including a cemented lens component.
Claim 10
Dependent Claim
64 words
A high magnification objective lens system comprising, in the order from the object side, a positive meniscus lens component concave on the object side, three cemented lens components, a pair of lens components having concave surfaces opposed to each other, a cemented lens component, a negative lens component concave on the object side and one or more lens components including a cemented lens component.
Claim 11
Dependent Claim
28 words
A high magnification objective lens system according to claim 8 wherein a positive lens component is arranged between any two of the first mentioned three cemented lens components.
References Cited (Backward Citations)
JPS60209715A
Cited
JPS60241009A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |